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ID:37113531
大小:2.29 MB
页数:52页
时间:2019-05-17
《替米沙坦对脂肪细胞环氧合酶2表达的影响》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、中文摘要研究背景脂肪细胞表达炎症介质,导致肥胖患者低水平的慢性炎症反应,并与2型糖尿病患者心血管功能紊乱和胰岛素抵抗的发生相关。脂肪细胞炎症基因表达下降可逆转这种慢性炎症状态,改善心血管功能和胰岛素敏感性。ARB类药物替米沙坦有改善胰岛素抵抗的作用,此作用可能与其抗炎机制相关。目的本研究拟通过观察血管紧张素Ⅱl型受体阻断剂(ARB)类药物替米沙坦对诱导成熟的3T3.L1细胞COX.2(cyclooxygenase2,环氧合酶2)基因的表达,COX-2相关下游产物PGE2(prostaglandinE2,前列腺素E2)的分泌,以及炎症相关信
2、号分子NF.KB(nuclearfactor-kappaB,核因子一KB)p65蛋白核移位的影响,探讨替米沙坦对脂肪细胞炎症相关介质COX-2的作用及其可能的机制。材料与方法在诱导成熟的3T3.L1细胞中加入不同浓度(OlIM,1llM,5llM,10uM)的替米沙坦培养24小时,用逆转录一聚合酶链反应(RT.PCR)方法检测COX.2的mRNA表达,酶联免疫吸附测定(ELISA)方法检测细胞上清液中PGE2的表达,免疫荧光方法检测NF.KBp65蛋白的核移位变化。结果(1)替米沙坦呈剂量依赖性地抑制3T3.L1细胞COX-2mRNA的表
3、达(P<0.05)。(2)替米沙坦呈剂量依赖性地下调培养的3T3.L1细胞上清液中PGE2的表达水平(尸4、torsthatcontributetothelow-level,chomcinflammationfoundinobesesubjectsandhavebeenlinkedtotheonsetofcardiovasculardisordersandinsulinresistanceassociated而Ⅱltype2diabetesmellitus.Areductionininflammatorygeneexpressioninadipocyteswouldbeexpectedtoreversethislow-level,inflamm5、atorystateandimprovecardiovascularfunctionandinsulinsensitivity.Tdmisartan,asanangiotcnsinIIreceptor1blocker,hastheeffectofinlp∞villginsulinresistance,whichmightbelinkedtoitsanti-inflammatorymechanism.ObjectiveInthepresentstudy,weexaminedtheCOX-2andCOX-2relateddownstreamp6、roductPGE2expessionaftertelmisartanincubationfor24hours,together埘mNF—r,Bp65translocationtothenucleusindifferentiatedadipocytes,inordertoexplorethecontributionoftelmisartantoinflammationmediatorCOX-2inadipoeytesanditsmechanism.MaterialandmethodsAfterdifferentiated3T3-L1der7、ivedadipocyteswereincubated、珩111telmisartanatthedoseofO,1,5,10UMfor24hours,COX-2geneexpressionin3"1"3-Ll-derivedadipocyteswasmeasuredbyRT-PCR,COX一2relateddownstreamproductprosm舀mdinE2(PGE2)expressionwasmeasuredbyELISA,theactivationstateoftheNF-1①p65WasasSeSSedbyimmunofluo8、rescence.ResultsDifferentiatedadipocytesexpressedthegeneforCOX-2,oneofthekeymediatorsoftheinflam
4、torsthatcontributetothelow-level,chomcinflammationfoundinobesesubjectsandhavebeenlinkedtotheonsetofcardiovasculardisordersandinsulinresistanceassociated而Ⅱltype2diabetesmellitus.Areductionininflammatorygeneexpressioninadipocyteswouldbeexpectedtoreversethislow-level,inflamm
5、atorystateandimprovecardiovascularfunctionandinsulinsensitivity.Tdmisartan,asanangiotcnsinIIreceptor1blocker,hastheeffectofinlp∞villginsulinresistance,whichmightbelinkedtoitsanti-inflammatorymechanism.ObjectiveInthepresentstudy,weexaminedtheCOX-2andCOX-2relateddownstreamp
6、roductPGE2expessionaftertelmisartanincubationfor24hours,together埘mNF—r,Bp65translocationtothenucleusindifferentiatedadipocytes,inordertoexplorethecontributionoftelmisartantoinflammationmediatorCOX-2inadipoeytesanditsmechanism.MaterialandmethodsAfterdifferentiated3T3-L1der
7、ivedadipocyteswereincubated、珩111telmisartanatthedoseofO,1,5,10UMfor24hours,COX-2geneexpressionin3"1"3-Ll-derivedadipocyteswasmeasuredbyRT-PCR,COX一2relateddownstreamproductprosm舀mdinE2(PGE2)expressionwasmeasuredbyELISA,theactivationstateoftheNF-1①p65WasasSeSSedbyimmunofluo
8、rescence.ResultsDifferentiatedadipocytesexpressedthegeneforCOX-2,oneofthekeymediatorsoftheinflam
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